Sun hat



FIG. 1 is a front perspective view of a sun hat showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left side thereof;

FIG. 6 is a bottom view; and,

FIG. 7 is a top view thereof.

The broken lines shown in the drawings are stitch lines and form a part of the claimed design. 

The ornamental design for a sun hat, as shown and described. 